add install.sh (#468)

install.sh

+#!/usr/bin/env bash
+
+APP_NAME="bee"
+REPO_URL="https://github.com/ethersphere/bee"
+
+: "${USE_SUDO:="true"}"
+: "${BEE_INSTALL_DIR:="/usr/local/bin"}"
+
+detect_arch() {
+  ARCH=$(uname -m)
+  case $ARCH in
+    armv5*) ARCH="armv5";;
+    armv6*) ARCH="armv6";;
+    armv7*) ARCH="arm";;
+    aarch64) ARCH="arm64";;
+    x86) ARCH="386";;
+    x86_64) ARCH="amd64";;
+    i686) ARCH="386";;
+    i386) ARCH="386";;
+  esac
+}
+
+detect_os() {
+  OS=$(uname|tr '[:upper:]' '[:lower:]')
+
+  case "$OS" in
+    # Minimalist GNU for Windows
+    mingw*) OS='windows';;
+  esac
+}
+
+run_as_root() {
+  local CMD="$*"
+
+  if [ $EUID -ne 0 ] && [ $USE_SUDO = "true" ]; then
+    CMD="sudo $CMD"
+  fi
+
+  $CMD
+}
+
+supported() {
+  local supported="darwin-amd64\nlinux-386\nlinux-amd64\nlinux-arm64\nlinux-armv6"
+  if ! echo "${supported}" | grep -q "${OS}-${ARCH}"; then
+    if [ $OS == "windows" ]; then
+      echo "Auto install not supported for Windows."
+      echo "Install binary from here $REPO_URL/releases"
+      exit 1
+    else
+      echo "No prebuilt binary for ${OS}-${ARCH}."
+      echo "To build from source, go to $REPO_URL"
+      exit 1
+    fi
+  fi
+
+  if ! command -v curl &> /dev/null && ! command -v wget &> /dev/null; then
+    echo "Either curl or wget is required"
+    exit 1
+  fi
+}
+
+# check_installed_version checks which version of bee is installed and
+# if it needs to be changed.
+check_installed_version() {
+  if [[ -f "${BEE_INSTALL_DIR}/${APP_NAME}" ]]; then
+    local version=$(bee version 2>&1)
+    if [[ "${version%-*}" == "${TAG#v}" ]]; then
+      echo "bee ${version} is already ${DESIRED_VERSION:-latest}"
+      return 0
+    else
+      echo "bee ${TAG} is available. Changing from version ${version}."
+      return 1
+    fi
+  else
+    return 1
+  fi
+}
+
+# check_tag_provided checks whether TAG has provided as an environment variable so we can skip check_latest_version.
+check_tag_provided() {
+  [[ ! -z "$TAG" ]]
+}
+
+# check_latest_version grabs the latest version string from the releases
+check_latest_version() {
+  local latest_release_url="$REPO_URL/releases/latest"
+  if command -v curl &> /dev/null; then
+    TAG=$(curl -Ls -o /dev/null -w %{url_effective} $latest_release_url | grep -oE "[^/]+$" )
+  elif command -v wget &> /dev/null; then
+    TAG=$(wget $latest_release_url --server-response -O /dev/null 2>&1 | awk '/^  Location: /{DEST=$2} END{ print DEST}' | grep -oE "[^/]+$")
+  fi
+}
+
+# download_file downloads the latest binary package and also the checksum
+# for that binary.
+download_file() {
+  BEE_DIST="bee-$OS-$ARCH"
+  if [ "$OS" == "windows" ]; then
+    BEE_DIST="bee-$OS-$ARCH.exe"
+  fi
+  DOWNLOAD_URL="$REPO_URL/releases/download/$TAG/$BEE_DIST"
+  BEE_TMP_ROOT="$(mktemp -dt bee-binary-XXXXXX)"
+  BEE_TMP_FILE="$BEE_TMP_ROOT/$BEE_DIST"
+  if command -v curl &> /dev/null; then
+    curl -SsL "$DOWNLOAD_URL" -o "$BEE_TMP_FILE"
+  elif command -v wget &> /dev/null; then
+    wget -q -O "$BEE_TMP_FILE" "$DOWNLOAD_URL"
+  fi
+}
+
+# install_file verifies the SHA256 for the file, then unpacks and
+# installs it.
+install_file() {
+  echo "Preparing to install $APP_NAME into ${BEE_INSTALL_DIR}"
+  run_as_root chmod +x "$BEE_TMP_FILE"
+  run_as_root cp "$BEE_TMP_FILE" "$BEE_INSTALL_DIR/$APP_NAME"
+  echo "$APP_NAME installed into $BEE_INSTALL_DIR/$APP_NAME"
+}
+
+# fail_trap is executed if an error occurs.
+fail_trap() {
+  result=$?
+  if [ "$result" != "0" ]; then
+    if [[ -n "$INPUT_ARGUMENTS" ]]; then
+      echo "Failed to install $APP_NAME with the arguments provided: $INPUT_ARGUMENTS"
+      help
+    else
+      echo "Failed to install $APP_NAME"
+    fi
+    echo -e "\tFor support, go to $REPO_URL."
+  fi
+  cleanup
+  exit $result
+}
+
+# test_binary tests the installed client to make sure it is working.
+test_binary() {
+  if ! command -v $APP_NAME &> /dev/null; then
+    echo "$APP_NAME not found. Is $BEE_INSTALL_DIR on your "'$PATH?'
+    exit 1
+  fi
+  echo "Run '$APP_NAME --help' to see what you can do with it."
+}
+
+# help provides possible cli installation arguments
+help () {
+  echo "Accepted cli arguments are:"
+  echo -e "\t[--help|-h] ->> prints this help"
+  echo -e "\t[--no-sudo]  ->> install without sudo"
+}
+
+# cleanup temporary files
+cleanup() {
+  if [[ -d "${BEE_TMP_ROOT:-}" ]]; then
+    rm -rf "$BEE_TMP_ROOT"
+  fi
+}
+
+# Execution
+
+#Stop execution on any error
+trap "fail_trap" EXIT
+set -e
+
+# Parsing input arguments (if any)
+export INPUT_ARGUMENTS="${@}"
+set -u
+while [[ $# -gt 0 ]]; do
+  case $1 in
+    '--no-sudo')
+       USE_SUDO="false"
+       ;;
+    '--help'|-h)
+       help
+       exit 0
+       ;;
+    *) exit 1
+       ;;
+  esac
+  shift
+done
+set +u
+
+detect_arch
+detect_os
+supported
+check_tag_provided || check_latest_version
+if ! check_installed_version; then
+  download_file
+  install_file
+fi
+
+test_binary
+cleanup